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Finding the Fourth Proportional to 860.72, 1,292.04 and 858.80

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Solution

The fourth proportional to 860.72, 1,292.04 and 858.80 is: 1,289.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.72 : 1,292.04 = 858.80 : x
  2. Step 2: Convert to fraction form
    860.72/1,292.04 = 858.80/x
  3. Step 3: Cross multiply
    860.72x = 1,292.04 × 858.80
  4. Step 4: Simplify right side
    860.72x = 1,109,603.95
  5. Step 5: Solve for x
    x = 1,109,603.95/860.72
  6. Step 6: Final answer
    x = 1,289.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.